JP-7856613-B2 - Battery status determination method and status determination system

Inventors

• 野口 直記
• 寺尾 美菜子
• 植村 英生
• 岡野 隼
• 尾上 由希子
• 冨永 由騎
• 大道 馨

Assignees

• 横河電機株式会社
• 本田技研工業株式会社

Dates

Publication Date

20260511

Application Date

20230922

Claims (15)

1. This involves obtaining a measurement value of the magnetic field of the battery installed in the device, measured by the magnetic measurement unit, and To calculate information regarding the relative position of the magnetic measuring unit based on the measured value of the magnetic field of the battery and the reference value of the magnetic field of the battery, A method for determining the state of a battery, which includes determining the state of the battery based on information regarding the relative position of the magnetic measuring unit.
2. A method for determining the state of a battery according to claim 1, comprising determining that the battery is abnormal when the information regarding the relative position of the magnetic measuring unit satisfies the abnormality determination conditions.
3. The battery state determination method according to claim 2, further comprising calculating a correction coefficient for the relative position of the magnetic measuring unit as information regarding the relative position of the magnetic measuring unit.
4. A method for determining the state of a battery according to any one of claims 1 to 3, comprising moving the magnetic measuring unit along one scanning direction in order to measure the magnetic field of the battery using the magnetic measuring unit.
5. The battery state determination method according to claim 4, comprising shifting the magnetic measuring unit to each of a plurality of positions arranged periodically or aperiodically in a direction intersecting the scanning direction, and moving it along the scanning direction from each position.
6. The battery state determination method according to claim 5, comprising shifting the magnetic measuring unit to each position where movement in the scanning direction began when measuring the reference value of the battery's magnetic field, and then moving it along the scanning direction from each position.
7. The magnetic measuring unit is moved in each of a plurality of directions, including at least a first direction and a second direction, to obtain a measurement value of the magnetic field of the battery. The battery state determination method according to claim 4, further comprising determining the scanning direction based on a first measurement value obtained by moving the magnetic measuring unit in the first direction and a second measurement value obtained by moving the magnetic measuring unit in the second direction.
8. The battery state determination method according to claim 4, comprising moving the magnetic measuring unit within a scanning range determined based on the type of device in which the battery is installed.
9. A battery state determination system comprising a magnetic measuring unit and a control device that performs the battery state determination method described in any one of claims 1 to 3.
10. The device further comprises a moving device for moving the magnetic measuring unit relative to the battery, The battery state determination system according to claim 9, wherein the moving device is configured to move between the surface on which the device equipped with the battery is installed and the battery.
11. The battery state determination system according to claim 9, further comprising a drive device for moving the device containing the battery relative to the magnetic measuring unit.
12. The battery state determination system according to claim 9, wherein the magnetic measuring unit comprises one or more magnetic sensors for measuring the magnetic field of the battery.
13. The battery state determination system according to claim 12, wherein the magnetic measuring unit comprises a plurality of magnetic sensors arranged in a linear or array-like manner.
14. The battery state determination system according to claim 12, wherein the magnetic measuring unit comprises a plurality of magnetic sensors arranged to cover the entire battery.
15. The battery state determination system according to claim 14, wherein the control device selects some of the multiple magnetic sensors and obtains the measured values of the selected magnetic sensors.

Description

This disclosure relates to a method and system for determining the state of a battery. Conventionally, devices are known that inspect batteries by comparing the current distribution of the battery under inspection with that of a normal battery (see, for example, Patent Document 1). Japanese Patent Publication No. 2020-187951 This is a side view showing an example of the positional relationship between the battery and the magnetic measuring unit.This is a plan view showing an example of the positional relationship between the battery and the magnetic measuring unit.This is a block diagram showing an example configuration of a state determination system according to one embodiment.This flowchart shows an example of a procedure for determining the battery status.This figure shows an example where the battery is arranged so that the arrangement of the battery cells aligns with the scanning direction of the magnetic measurement unit.This figure shows an example where the battery is arranged so that the arrangement of the battery cells is tilted relative to the scanning direction of the magnetic measurement unit.This figure shows an example where the battery is arranged so that the arrangement plane of the battery cells is parallel to the scanning plane of the magnetic measurement unit.This figure shows an example where the battery is arranged so that the arrangement plane of the battery cells is tilted relative to the scanning plane of the magnetic measurement unit.This figure shows an example of a battery arrangement where the distance between the arrangement of the battery cells and the scanning path of the magnetic measurement unit changes.This graph shows an example of the waveform of the magnetic field measurement value measured by the magnetic measurement unit when the battery position is shifted in the scanning direction of the magnetic measurement unit.This graph shows an example of the waveform of the magnetic field measurement value measured by the magnetic measurement unit when the battery is positioned so that the distance between the arrangement of the battery cells and the scanning path of the magnetic measurement unit is increased.This graph shows an example of the waveform of the magnetic field measurement value measured by the magnetic measurement unit when the battery is positioned such that the arrangement plane of the battery cells rotates around a rotation axis that intersects the scanning direction of the magnetic measurement unit.This is a three-dimensional graph showing an example of the waveform of the magnetic field measurement value for each scanning path, obtained by scanning the magnetic measurement unit through multiple scanning paths.This figure shows an example of scanning the magnetic measurement unit in two intersecting directions to pre-check the arrangement of battery cells.This is a side view showing an example of a moving device for moving the magnetic measuring unit in the scanning direction.This is a plan view showing an example of a drive system for moving a vehicle equipped with batteries. A magnetic field is generated when charging and discharging current flows through a secondary battery. The state of a secondary battery can sometimes be inspected by measuring the magnetic field generated during charging and discharging. A battery whose magnetic field is to be measured is, for example, a battery having an electrode body in which a positive electrode active material layer and a negative electrode active material layer are stacked with an insulating layer in between, and an outer casing housing the electrode body. Hereinafter, embodiments of the battery state determination method and state determination system 1 (see Figure 3) according to this disclosure will be described in comparison with comparative examples. (Comparative example) The apparatus in the comparative example first obtains data on the current distribution of a normal battery by placing a normal battery in a reference position and measuring the magnetic field when a reference current is passed through the normal battery using a magnetic measuring unit. The apparatus in the comparative example first obtains data on the current distribution of a battery to be tested by placing the battery to be tested in a reference position and measuring the magnetic field when a reference current is passed through the battery to be tested using a magnetic measuring unit. The apparatus in the comparative example determines the state of the battery to be tested by comparing the current distribution data of the battery to be tested with the current distribution data of a normal battery. Here, if the battery being tested is misaligned from its reference position, an error occurs in the current distribution data of the battery being tested. This error in the current distribution data reduces the accuracy of the battery condition test. In other words, misalignment of the battery being tested affects the accuracy of the battery c